hartley



(No Model.) 3 ShetsSheet 1.

J, W. HARTLEY.

VARIABLE EXPANSIVE AND REVERSING MOTION FOR OSOILLATING CYLINDERENGINES.-

No. 388,558. Patented Aug. 28, 1888;

Flgl

WIEEEEE v O: I\7E tar id J FTQMW' N, Prisms. hobLil-Mgnu m Vlanhirqmn.o. c.

(No'Modelf 3 Sheets-Sheet 2.

I J. W- HARTLEY. VARIABLE EXPANSIVE AND REVERSING MOTION FOR OSOILLATINGCYLINDER ENGINES. N0. 388,558 Patented Aug. 28 1888.

Fig 2 N. PETERS. Halo-Lithographer, Willimgiun. D-Q

(No Model.) 3 Sheets-Sheet. 3 i

J-. W. HARTLEY. l

VARIABLE EXPANSIVE AND REVERSING MOTION FOR OSOILLATING OYLINDERENGINES.

No. 388,558. Patented Aug. 28, 1888.

EH] LL \X/Ih EEE EE.

UNITED STATES PATENT O FICE.

JOHN WILLIAM HARTLEY, OF STO KE-ON-TRENT, COUNTY OF STAFFORD, ENGLAND.

VARIABLE EXP ANSlVE AND REVERSING MOTION FOR OSCILLATING-CYLINDERENGINES.

SPECIFICATION forming part of Letters Patent No. 388,558, dated August28, 1888.

Application filed October 14, 1887. Serial No. 252.325. (No model.)Patented in England March 20, 1886, No. 3,927; in France December 15,1886, No.180.295, and in GermanyDccember 31,1886, No. 40,138.

To all whom it may concern:

Be it known that I, J oI-IN WILLIAM HART- LEY, a subject of the Queen ofGreat Britain, residing at Stoke-on-Trent, in the county of Stafford, inthe Kingdom of Eugland,have invented certain new and useful Improvementsin Variable Expansive and Reversing Motion for Oscillating-CylinderEngines, (for which Letters Patent have been issued in England, datedMarch 20, 1886, No. 3,927; in France, dated December 15, 1886, No.180,295, and in Germany,dated December 31,1886,N0.40,13S,) of which thefollowing is a specification.

My invention consists of an improved variable expansive and reversingmotion for oscillating-cylinder engines, which I obtain without the useof eccentrics as usually applied. For the purpose of my invention I usethe following apparatus: Through a suitable arm or bracket attached tothe cylinder of an oscillating engine I pass a pin, which serves as afulcrum for a rocking lever. Upon said rocking lever and at a suitabledistance from the fulcrum I fix a pin, which acts as a fulcrum foranother lever,one end of which is attached to the slide-valve rod. Theother endI attach to a block, which slides in a curved slotted link asthe cylinder oscillates. Said link is supported upon a fulcrum fixed toengineframe,its center being in a direct line between the center ofoscillation and the center of crank-shaft. The center line of curvedlink is at all points equidistant from center of 0s cillation when inmid-position. I make said curved link to vibrate upon its center whenmoved from mid-position, and as the cylinder oscillates motion is givento the sliding block, and from thence to the slide-valve, by means ofthe before-named levers. By moving thecurved link upon its fulcrum ineither direction from its mid-position the engine is reversed. To enableme to employlap and leadin order to use the steam expansively, I fit asuitable bracket or arm upon the valve box or cylinder, and to the endof this bracket or arm I fix a pin, which acts as a fulcrum to a lever.One end of said lever I connect to before-named rocking lever by meansof a rod or link, and the other end I connect to the piston-rod by ashort link or by other suitable means. \Vhen the piston-rodreciprocates, a corresponding vibratory motion is communicated to thesaid lever, and by means of the rod or link to the before-named rockinglever, which in its turn transmits the motion to the valve. By properlyproportioning the levers I obtain the ad ditional movement required toenable lap and lead to be added to the valve.

The accompanying drawings illustrate my invention and methods ofapplying same.

Figure 1 is a sectional view. Figs. 2 and 3 are also sectionalviewsshowing different methods of arranging the levers. Fig. 4 is anelevation at right angles to Fig. 3;. Fig. 5, an elevation at rightangles to Fig. 1.

The same letters refer to the corresponding parts in each figure.

Referring to Fig. 1, A represents the cylinder ofan ordinary oscillatingengine; B,(shown in other figures,) the trunnion or center of 0scillation. Upon cylinder-cover D, I attach bracket E,acting as a fulcrumfor lever F,and upon lever F,Ifix apin, G, forming a fulcrum to lever H.

One end of said lever H, I attach to valverod I, which gives motion tothe slide-valve J. To the other end of said lever II, I attach a shoe,K, which is slotted out to fit upon a curved rocking bar or link,L,or,if preferred, a block and slotted link of the ordinaryconstruction. Thesaid shoe K is flanged up to fit the curved rocking baror link L and slides upon it as the cylinder oscillates. The said curvedbar or link works upon a pin, M, fixed in a suitable position uponstationary portion of frame, andis in this instance in a direct linebetween the cen ters of oscillation B and crankshaft N. When curvedrocking bar or link L is in mid-position, its center line is at allpoints equidistant from center of oscillation B, and when the cylinderoscillates with link in this position no motion is communicated to shoeK and slide-valve J. Upon moving curved rocking bar or link L upon itscenter either way according to the direction the engine is desired torotate, motion is transmitted to the slide-valve through lever H as thecylinder oscillates, thereby causing the engine to rotate in onedirection, and when the curved bar or link L is moved in the oppositedirection the engine will be reversed by admitting steam to the oppositeend of the cylinder. From the foregoing it is obvious that this mo,-tion could be obtained with the curved link only, and the fulcrum Gfixed to the cylinder, as is frequently the case in cheap types of0seillating engines; butit will also be seen that no motion can becommunicated to the shoe K and from thence to the valve J as the crankis passing the dead-centers. Thus neither lap nor lead can be used, sothat with engines constructed as described steam cannot be usedexpansively.

In order to use lap and lead and give the necessary additional travel tothe valve at each end of the pistons'stroke, Iattach to outer end oflever F a connectingrod, O, the other end of which I attach by a pin, Q,to vibrating lever P, which vibrates upon fulcrum It. I carry fulcrum Rupon a suitable bracket extending from any convenient part of cylinderor valve-chest, and which oscillates therewith. The other end of saidlever P, I connect to piston cross-head T by means of a short link, U,or to piston-rod, in other convenient manner. Lever P vibrates to andfro with reeiproeating motion of piston cross'head, giving motionthrough connecting-rod O tolever F and fulcrum G, and thence to lever H.Accord ingly it will be seen that the center of shoe K, which at thispoint may be near its dead-center and almost stationary, becomes thefulcrum for this motion, and thus the end H of lever H is given anincreased throw, which it communicates to the slide-valve J. Iproportion these levers so as to give to the slide-valve an amount oftravel at each stroke of the engine equal to the sum of the lap and thelead, and this, be it observed, is a constant quantity independent ofthe position of the curved bar or link L.

To obtain a variable expansive motion, I employ a lever and quadrant ofordinary construction, attached by a suitable rod to end of curved baror link L, so that I can move said curved bar therewith and fix it inany desired position. I then move said curved bar out of its centralposition in either direction to a greater or less degree, whichcorrespondingly increases or decreases the travel of the valve,consequently cutting the steam off earlier or later, varying theexpansion accordingly.

In the end of lever P, I form a slot, wherein the pin Q is fitted, andby moving this pin farther from fulcrum R, I increase the throw of leverF, thus compensating for any wear or slackness in the joints of thelovers.

Fig. 2 shows an arrangement with lever P carried upon opposite side ofcylinder to that shown at Fig. 1.

Figs. 3 and 4 show arrangement of levers where I obtain the desiredmovement of lever F from a return-crank, V, instead of pistonrod, as inFigs. 1 and 2.

I would also have it understood that I do not confine myself to theexact details hereinbefore described, as the same admit of modificationwithout departing from the essential features of my invention.

I claim as my invention- 1. In combination with an oscillating cylinder,A, the reversing-lever X, curved link L, slide-block K, and lever H,linked orjointed to the block K and to the valve-rod I, and pivoted on afulcrum oscillating with cylinder A, substantially as described.

2. The combination of reversing link L, slide-block K, and lever H,connecting same to the valve-rod with fulcrum G, having motion takenfrom the pistonrod, but reduced in amount.

3. The combination, in an oscillating engine, of the fulcrum G of thelever H, (whereby the slide-block is connected to the valve-rod,)withlever F, fulcrumed on a point rigidly fixed to the cylinder, and devices0 P U, for transmittingaredueed motion from thepiston-rod, sub-'stantially as and for the purposes described.

4. The combination, in an oscillating engine, of the lever H, that givesmotion to the valverod, with a fulcrum, G, having a motion correspondingto that of the pistourod, but redueed,whereby the necessary additionaltravel of the valve is obtained to allow for lap and lead and to workexpansively.

5. The combination, in a valve-gear for eccentric engines, ofthe leverF, carrying the fulcrum of the valve-rod-aetuating lever H, link 0,slotted lever Q, and link U, connecting Q to the piston-connections,whereby the motion of the piston in a reduced form is transmitted to thevalve-rod actuating lever H.

6. The mechanism for regulating the lead in oscillating engines,consisting of a lever, F, carrying the fulcrum of thevalve-rod-actuating lever H, a lever, P, oscillating on a point, B,oscillating with the cylinder and linked to the piston-rod connections,with a rod, 0, eapable of being attached to lever P at any requiredpoint between limits by means ofa linking device, Q.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN XVILLIAM HARTLEY.

\Vitnesses:

A. E. HARnIsoN, EDWARD SCRAGG.

